Information Letter No. 18-04  This letter provides an annual update to the International Classification of Diseases, Tenth Revision (ICD-10) code set as of October 1, 2017, which includes new and revised ICD-10 diagnostic codes. Health and Human Services Commission (HHSC) has revised the HHSC-Approved Diagnostic Codes for Persons with Related Conditions. List of Invalid ICD-10 Related Conditions Codes: The following ICD-10 diagnoses codes are no longer valid and were deleted from the … [Read more...] about Changes to HHSC-Approved Diagnostic Codes for Persons with Related Conditions List